feat(m15): nvidia-smi snapshot + display logs + inventory in reports — 0.32.0

Expand diagnostic/report collection (all stored per-diagnostic, in the Report zip;
logs also fed to the AI on "Explain"):
- syslogs: nvidia-smi -q snapshot (driver/throttle/clocks/power/temps/PCIe/ECC/
  retired pages) + display-server log auto-detected — Xorg.0.log on X11, or the
  compositor user-journal slice (gnome-shell/kwin/sway/gamescope) on Wayland.
- diagstore: include the full M5 inventory (inventory.txt + .json) — invaluable
  for larger/shared debugging. inventory.collect() degrades gracefully (no root
  prompt). Best-effort throughout.
- Tests for nvidia/display + inventory in store; docs (M15/SPEC).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/SPEC.md

@@ -165,10 +165,11 @@ the actual findings plus matched reference facts from a curated, exact-match kno
 ### M15 — Logging & report bundles (D25)
 Opt-in (one `logging_enabled` toggle, default off). When on: the application logs to a rotating
 `app.log`, and **each diagnostic is stored in its own directory** (capture log, structured
-result, human-readable report, session-scoped **game logs** (Proton/Steam) and **system logs**
-(`journalctl -k` slice + `coredumpctl` crashed-process records), and a record of every AI
-interaction — the exact data sent, the model, and its reply). The collected logs are also fed to
-the AI on "Explain". System-log collection is best-effort (degrades if tools are missing/denied). A **Report** action zips one diagnostic's directory
+result, human-readable report, the full **inventory** (M5 hardware/OS), session-scoped **game
+logs** (Proton/Steam) and **system logs** (`journalctl -k`, `coredumpctl`, an `nvidia-smi -q`
+snapshot, and the X11/Wayland display-server log), and a record of every AI interaction — the
+exact data sent, the model, and its reply). The collected logs are also fed to the AI on
+"Explain". Collection is best-effort (degrades if tools are missing/denied). A **Report** action zips one diagnostic's directory
 (plus the app log) into a shareable bundle saved under the reports folder (GUI button; CLI
 `rigdoctor bundle`). Everything stays local — a report only leaves the machine if the user
 shares the zip. Stdlib only (`logging` + `zipfile`).